Grinding roll



Feb. 6, 1945. A. E. HAMILTON 2,368,760

GRINDING ROLL Original Filed Jan. 18, 1943 2 Sheets-Sheet 1 INVENTOR.

1:. HIM/m Feb. 6, 1945. A. E. HAMILTON GRINDING ROLL 2 Sheets-Sheet 2Original Filed Jan. 18, 1945 INMENHZQR. flineso ..-Hfimuram nfroplvexPatented Feb. 6, 1945 I Yasea'zso GRINDINGROLL; Alfred E. Hamilton,Pittsburgh, Pa.

Original application January 18, 1943, Serial'No. 472,696., Divided'andthis application October 15, 1943, Serial No. 506,329 i i l 7 Claims.01. 51-194) My invention relates to an apparatus for the surfacing ofmaterials of various kinds, such as strips or sheets of steel,transparent plastic sheets, etc., by grinding andpolishing, the presentcase being a division of my application Ser. No. 472,696, filed January18, 1943.

The present invention relates particularly to grinding and polishingapparatu wherein the abrasive or surfacing materials arecontained onsheets or strips that are placed upon surfacing rolls, usually in theform of sleeves that are replaced as they become worn. The sleeve-likeor tubular coverings for the rolls are not entirely satisfactory,because the rolls have to be partly or entirely dismounted from thegrinding machine, in order to permit replacement when the abrasivebecomes worn. Again, it is diflicult to make sleeves always of theprecise diameter for accurate fit with the rolls.

One object of my invention is to provide an improved form of surfacingrolls, wherein the surfacing material is contained on strips that arehelically wound or wrapped on the rolls.

v Another object of my invention is to provide an. improved manner fordetachably fastening abrasive strips on surfacing'rolls.

As shown on the accompanying drawings Fig-.

ure 1 is a side view, partly in section, of apparatus embodying myinvention; Fig. 2 is an end view of one of the surfacing rolls of Fig.1; on an will have sufficientlysnug fit with its hub to maintain itagainst turning on'the hub under grinding friction and to maintain ahelically wound abrasive strip l8 'taut thereon. Also, the pressure canbe controllably varied to suit various grinding conditions. For example,a high pressurewill be employed when an intense surenlarged scale,showing the manner in which the abrasive strips are detachably held onthe surfacing rolls; Fig. 3 is an enlarged view looking inthe directionof the arrows IIIIII of Fig. 2; Fig.4 is a view taken on the lineIVIV ofFig. 2; Fig. 5 is a projected view showing one of the abrasive stripsthat are wound on the drum; Fig. 6 is aface-view, On a. reduced scale,showing how the abrasive strip is helically wound on a drum, and Fig. 7is an enlarged sectional view through a portion of one of the surfacingdrums, showing the manner in which an abrasive strip is wound thereon.

The apparatus comprises surfacing rolls 'IO and H between which ispassed the strip or sheets that are to be ground and polished. Theserolls are mounted on shafts l2 and I3 respectively that are supported'insuitable bearings and frame work, as set forth in my said-application,the shafts bein'g'driven from a suitable source of power. Where only oneside of a sheet is to be surfaced, an idlingly rotatable billy roll maybe substituted for the roll ll. Each roll comprises a hub portion l4having a circular 'plate [5 on which is supported a pneumatic drum 16"of rubber or the like, the drum being held in place on the hub by aremovable end plate II that forms part of the hub.

'Air pressureis maintained in the annular pace within each pneumaticdrum 5, so that it facing. action is required-on a strip or sheet, and

lower ressures for lighter grinding or surfacing operations. Thepressure in the rolls may suitably vary from 5 lbs. to 20 lbs. persquareinch,

depending upon the grain\size of the abrasive 'or the nature of theworkbcing operated upon.

Each of the roll shafts I2 and I3 has a passageway formed therein thatcommunicates with pipes l9 and 20 respectively, the said pipe of courserotating with the drums and the shafts.

On the shaft l2, stuinng boxes 22 are mounted to scale. header collar 23in which the shaft'rotat'es. A hose or pipe 24 communicates through thecollar 23 with the passageway in the shaft l2. A swiveljoint 25 isprovided at one end of the shaft l3so that air flow can bemaintained to'the passageway in said shaft from a pipe 26,

while the shaft is rotating.

A reservoir 21 is supplied'with air under pressure through a pipe 28,from a suitable compressor (not shown). When it is desired that thepressures in the rolls be identical, air is suppliedfrom'the reservoir21 past a pressure-reducing valve 29 and through a pipe 30 to theupperdrum, while such supply will be through a pipe 3! to the lowerdrum. If pressures of'different degrees are required in the upper andlower drums, a valve 32 in the line 3| will be,

closed, and a valve 33in a line 34 will be opened. Thereupon pressure tothe lower drum will be through a pressure-reducing valve 35 and throughpipes 33 and 26, to the lower shaft l2.

The pressure-reducing valves may be of any conventional form and canbeadjusted by their handles 35 and 36, to automatically effect supply ofair at a desired pressure tothe drums,'which pressure will ordinarily besomewhat less than the pressure in the reservoir 21. In order to preventan excess of pressure being developed in the drums, as a result of heatthrough grinding fric- 't'ion 'or increase of atmospheric temperatures,I

provide pressure reliefvalves 38 and 39 that are adjustable to permitautomatic exhaust of air from the, drums at pressures above that atwhich the air is being supplied past the regulator valves 29 and 34.These valves 38 and'39 may be of conventional form and adjustments aremade strips.

strips will be Wider than other strips that may be used on the drums andwill, therefore, be wound on a different helical pitch than narrower.Again, some; strips willhav re te stretch than others, under theexpansive pressures and centrifugal forces, and this tendency H willvary with the helical pitch at which a strip is wound on the drum. Thepneumatic PKQS13F$ must, of course, be sufiicient to preventdisplacementof the strip on the drum during grinding operation and stillmust not-basogreahas n mp5. ture the strip. Reinforcing cords of ,iahnicA are preferably provided in the rubber drums, control the expansionthereof and to assist in maintaining the cylindrical contour of thedrum:

In Figs. 2 to 7, I show details of the. manne in which the abrasive.strip 1,8 ;is,,applied. .to -.and connected with the roll.lllsthefabrasiye .strip on the other roll .|.I being pimilaigly. appliedThe abrasive .strip- 1 8 .-iS ..h e1 i C8i1I y, wound ,upon the; mIll... This s inma h of water roof sand ape m ry cl thpr the .like.-The-ends -ing, a$1 1 nts ,at annularly spaced points on the ,flQIIQQJQrholding the belt on the said flange.

of thestrip l8aretapered-as at-Ads tn tthe .end. turns, thereof willoverliea flange. 45..that, is

formed on the huh, Withoutproiecting .beyondthe flange. The turnslofthe-strip will have an Overapp e a ea a 4. andlh uter wall-oi the drum.is helically .grooved. or depressed to ac.- commodate the.doublethickn85 .Qf strip .atAS, ereb p i n I 2 QS11 Il 1lymo0thandcontinuous ,abr'ading .suliace.. Thiigroove also resists tendency .ofthe strippturnsto.creepaxial- I 1y. on the drum.

h ds. of the str-i p: 1 8 a de hshahlys e cured to. the annular.flanges. 45 at. the, endsm. the hubs, .by metal. 'strapsfor-hoo s 4LThe...ta-

pered ends 44 of the strips are wrappedamund the flanges 4.5 and thestraps. pla'cedover the same. The flange &5. is broken. and has .intumed ends at 48 between Whioha portion .of the strap is passed andextends aroundthe .shafl i 1.2 and through'a yoke 49..

A pin .50 extends. throu h 2. Grinding apparatus comprising asurfacingroll, an abrasive strip helically wound on said 'roll, anannular flange extending axially at one endaof: the. roll positipn. toreoeive an end turn of the strip, an endless belt surrounding said endturn and having a looped portion extending through, the flange towardthe axis of the roll, means for tightening and anchoring said loopedportion'to hold the beltin clamping engagement with the'sa'id-end turnof the stripgand retain- .3; Grindingapparatus comprising a surfacingroll, an abrasive strip helically wound on said.

rollpa-n "annular flange extending'axially at one .endof theroll inpositionto. receive .anaendturn of .the.str ip,;a belt-surroundingsaidendturnand having .a, looped portion. extending through he flah e-towaidathe axis .of. the roll, .meansim .anchorinasaid looped portion to.holdjthe belt in clamping engagement with the said-..en dturn. of the.strip, and retaining. elements. carried bythe outermostedg .of .thebelt..and slidably conneoted to holding elements that. .are carried by vtheflange, wh reby the belt. is. held against.- dislplacementirom theflange but can-have slight sliding .movement thereon. concentrically the.rolla'xis during tensioningof. the .sanieagainst roll havingaxially-extending annular flanges at itsends, a flexihlev strip .ofsurfacing .m'aterial surrounding the roll and overlying said flanges.

h -.ehdl urn of h i -i 4. Grinding apparatus comprising a surfacing anendless belt at each end IoftherolL'overlying the saidstrip and holdingittightly onj thefadjae centflange, the helthaving aloopedpqrtionextending throughthe flange, an anchoring. device-carriedby the .adjacentend wall .otthe roll and extendin through the loopedportionpi the belt, and means v,for.adiosting the .saidnevice radiallyof the drum, toti'ghten'thebelt.

the legs of the yoke, forsupportinga1; eye \bolt serving. as ,a ,braceto resistmdial.thrnstslonthe "bracket member t2, when thenuts..a.1e.-li2um&d to,. tighten. the strap. 41,; Clip.-like,.elements-.56

are welded to the edge'oi thenstrapi Aland-file p o ided wi h elon ated.holesi ithrouehwh hh screws 5B,.extend, the inns: ends. 9f the. screwsbein .threaded'into the dense. .45. Tha'sorews:

together with thec i s 1.55.. hoid...tne;s mp.

a ainst sliding of the .fiangeufli while the. elone tedholes allow the.necessary .slight. ciroumferential slidin of the strap .4] durin thetieheningv thereof.

I claim as ,m invention;

1. Grindin apparatus.comprisinga urfacing.

roll, .anabrasive strip helically wo nd id 1, an annular flan e extendinal y at. n end :of the roll, in positionto receive .an endturn of thestrip, an .endlessbe lt surrounding; saidend r turn and having a loopedportionuii'ttinding 1 throu h theflange toward the axis.of..the;.r-.oll, andmeansfor tightening and, 'anchoriog'said loopedportion to hold the belt clahi h zeugagement with .thesaid endturn.oithelstrips.

, toihold it on theroll; ,a ;-por .tion,.oi eachheltheing .5. Grindingapparatus comprising. .a .surfacing roll, a f exible..,.stri;p.of.suriiacingmaterial surrounding theroll, an. endless belt. at each. endor the roll, overlying edgegportions to. the strip loopedinwardly.toward. the axis of. the n means exte ding throueh'the loopLa-hdadjustable. radially of the. roll, 1 to tighten thegbelt.

fi-rfitin ina pparatus glomprising a surfacing r.ol ,1...s,ecured to arotatableshaft, .a: flexible strip or ,suriaeing material surroundingvthe .rollll'aii En ess el a ea h. end. .of the- .roll,. overlying edgeportions. of the. strip-to. hold .it ontherol l,

3 a portion of .eachbelt beingloopedein wardly.and

.extend ngqaround theflsha ft and alhelt tighten.-

' ingand anchoring: device engaging the innermost portion of the beltand adjustablefradiallygof the hat-tie tighten. thelbelh 1 so '1. fi indha ahpa a mm risine a ur acin .rQlLsecu'redtOa rotatable, shaft, afiexibleastrip oi, surfacing material,,.surrounding. the roll,,.}anendless.- belt-at .eacht-endioi the roll, overlying edge. portionsofthe. stripto hold it on the roll,

.a pottion of eachbelt .beinjg. loopedtinwardly and s:xh t le. arch d te sham. at ittigntje n and, anchoring; devise engaging. innermostportionof the belt and adiusftableradiallyioiflthe shaft, t t hten the.elt. and retaininaelements ca ie b t 1 1] i h it o ea ifll outermostedges. of. :theebeltland prevent lendv'vise displacement.thereottfronnthe 17011....

